Package com.luciad.projection
Class TLcdStereographic
java.lang.Object
com.luciad.projection.ALcdProjection
com.luciad.projection.ALcdAzimuthal
com.luciad.projection.TLcdStereographic
- All Implemented Interfaces:
ILcdAzimuthal
,ILcdProjection
,ILcdPropertyChangeSource
,Serializable
,Cloneable
Stereographic projection.
Introduction
Azimuthal conformal projection with a projection point opposite the origin of the projection.
Properties
- The projection is conformal.
- The central meridian and a particular parallel (if shown) are shown as straight lines.
- All meridians on the polar aspect are projected as straight lines.
- The Equator on the equatorial aspect is projected as a straight line.
- All other meridians and parallels are projected as arcs of circles.
- Directions from the projection origin are
true
. - Scale increases away from the projection origin.
- It is not possible to plot the point opposite the projection origin.
- The projection is used for polar maps and miscellaneous special maps.
Example
Sample code
ILcdProjection projection =
new TLcdStereographic(20.0, -30.0);
Implementation aspects
The equations of the stereographic projection are taken from [Snyder1987].
- See Also:
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Field Summary
Fields inherited from class com.luciad.projection.ALcdProjection
fPropertyChangeDispatcher
Fields inherited from interface com.luciad.projection.ILcdProjection
EPSILON
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Constructor Summary
ConstructorDescriptionConstructs a stereographic projection with the origin at a point(0.0, 0.0)
.TLcdStereographic
(double aLongitude, double aLatitude) Constructs a stereographic projection with the origin at a point(aLatitude, aLongitude)
.TLcdStereographic
(ILcdPoint aOrigin) Constructs a stereographic projection with the origin at anILcdPoint
aOrigin
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Method Summary
Modifier and TypeMethodDescriptiondouble[][]
boundaryLats
(double aLon) Default implementation.double[][]
boundaryLons
(double aLat) Default implementation.protected void
Constants based on the point of origin of the projection don't have to be recalculated every time a method is called.clone()
Makes a deep clone of thisILcdProjection
.boolean
inLonLatBounds
(ILcdPoint aLLHP) Checks if anILcdPoint
is inside the valid area of geodetic coordinates of the projection.boolean
inWorldBoundsOnEllipsoid
(ILcdPoint aXYPoint, ILcdEllipsoid aEllipsoid) Default implementation callsinWorldBoundsOnSphere
withaEllipsoid.getAuxRadius()
as sphere radius.boolean
inWorldBoundsOnSphere
(ILcdPoint aXYPoint, double aRadius) Checks if aILcdPoint
is inside the valid cartesian area of the projection.boolean
If all geodetic coordinates (l ,j ) are projected (visible) by anILcdProjection
and all (x,y ) coordinates are bounded this istrue
.void
lonlatheight2worldOnEllipsoidSFCT
(ILcdPoint aLLHP, ILcdEllipsoid aEllipsoid, ILcd2DEditablePoint aWorldPoint) Default implementation callslonlatheight2worldOnEllipsoidSFCT
withaEllipsoid.getAuxRadius()
as sphere radius.void
lonlatheight2worldOnSphereSFCT
(ILcdPoint aLLHP, double aRadius, ILcd2DEditablePoint aWorldPoint) Transforms anILcd2DEditablePoint
on a sphere into the cartesian coordinate system of the projection.toString()
Returns theString
representation of the stereographic projection.void
world2DEditableBoundsOnEllipsoidSFCT
(ILcdEllipsoid aEllipsoid, ILcd2DEditableBounds aWorldBoundsSFCT) Default implementation callsworld2lonlatOnSphereSFCT
withaEllipsoid.getAuxRadius()
as sphere radius.void
world2DEditableBoundsOnSphereSFCT
(double aRadius, ILcd2DEditableBounds aWorldBound) The projection is cut off because only one hemisphere is projected.void
world2lonlatOnEllipsoidSFCT
(ILcdPoint aXYPoint, ILcdEllipsoid aEllipsoid, ILcd2DEditablePoint aLLPSFCT) Default implementation callsworld2lonlatOnSphereSFCT
withaEllipsoid.getAuxRadius()
as sphere radius.void
world2lonlatOnSphereSFCT
(ILcdPoint aXYPoint, double aRadius, ILcd2DEditablePoint aLLPSFCT) Transforms anILcdPoint
from the cartesian coordinate system of the projection into anILcd2DEditablePoint
onto a sphere.Methods inherited from class com.luciad.projection.ALcdAzimuthal
equals, getOrigin, getOriginLat, getOriginLon, hashCode, isContinuous, loadProperties, setOriginLat, setOriginLon, writePropertiesSFCT
Methods inherited from class com.luciad.projection.ALcdProjection
addPropertyChangeListener, firePropertyChangeEvent, removePropertyChangeListener
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
Methods inherited from interface com.luciad.util.ILcdPropertyChangeSource
addPropertyChangeListener, removePropertyChangeListener
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Constructor Details
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TLcdStereographic
public TLcdStereographic()Constructs a stereographic projection with the origin at a point(0.0, 0.0)
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TLcdStereographic
public TLcdStereographic(double aLongitude, double aLatitude) Constructs a stereographic projection with the origin at a point(aLatitude, aLongitude)
. The central meridian is at the longitudeaLongitude
.- Parameters:
aLongitude
- longitude of the origin of the projection, in decimal degrees.aLatitude
- latitude of the origin of the projection, in decimal degrees.
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TLcdStereographic
Constructs a stereographic projection with the origin at anILcdPoint
aOrigin
. The central meridian is ataOrigin.getX()
.- Parameters:
aOrigin
-ILcdPoint
of the origin of the projection.aOrigin
is cloned within the constructor, so no side effects will happen to the projection as a result from changes toaOrigin
.
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Method Details
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calculateCachedValues
protected void calculateCachedValues()Description copied from class:ALcdAzimuthal
Constants based on the point of origin of the projection don't have to be recalculated every time a method is called. They only have to be calculated when the projection properties change. Within the methods the pre-calculated values then can be used in order to gain efficiency.- Overrides:
calculateCachedValues
in classALcdAzimuthal
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isAllInBounds
public boolean isAllInBounds()Description copied from interface:ILcdProjection
If all geodetic coordinates (l ,j ) are projected (visible) by anILcdProjection
and all (x,y ) coordinates are bounded this istrue
. AllILcdProjection
objects have bounded (x,y ) coordinates because the projection is cut off if necessary.- Returns:
true
if all LonLatPoints are within the bounds of the projection,false
otherwise.
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lonlatheight2worldOnSphereSFCT
public void lonlatheight2worldOnSphereSFCT(ILcdPoint aLLHP, double aRadius, ILcd2DEditablePoint aWorldPoint) throws TLcdOutOfBoundsException Description copied from interface:ILcdProjection
Transforms anILcd2DEditablePoint
on a sphere into the cartesian coordinate system of the projection.- Parameters:
aLLHP
- point to be projected.aRadius
- radius of the sphere (meters).aWorldPoint
- projected point as side effect.- Throws:
TLcdOutOfBoundsException
- If theILcdPoint
aLLHP
is not within the valid area of the projection (visible area), then this exception is thrown.
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lonlatheight2worldOnEllipsoidSFCT
public void lonlatheight2worldOnEllipsoidSFCT(ILcdPoint aLLHP, ILcdEllipsoid aEllipsoid, ILcd2DEditablePoint aWorldPoint) throws TLcdOutOfBoundsException Description copied from class:ALcdProjection
Default implementation callslonlatheight2worldOnEllipsoidSFCT
withaEllipsoid.getAuxRadius()
as sphere radius.- Specified by:
lonlatheight2worldOnEllipsoidSFCT
in interfaceILcdProjection
- Overrides:
lonlatheight2worldOnEllipsoidSFCT
in classALcdProjection
- Parameters:
aLLHP
- point to be projected.aEllipsoid
- ellipsoid on which the point is defined.aWorldPoint
- projected point as side effect.- Throws:
TLcdOutOfBoundsException
- If theILcdPoint
aLLHP
is not within the valid area of the projection (visible area), then this exception is thrown.
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world2lonlatOnSphereSFCT
public void world2lonlatOnSphereSFCT(ILcdPoint aXYPoint, double aRadius, ILcd2DEditablePoint aLLPSFCT) throws TLcdOutOfBoundsException Description copied from interface:ILcdProjection
Transforms anILcdPoint
from the cartesian coordinate system of the projection into anILcd2DEditablePoint
onto a sphere.- Parameters:
aXYPoint
- projected point for which the corresponding geodetic point is sought.aRadius
- radius of the sphere (meters).aLLPSFCT
- resulting geodetic coordinate as side effect.- Throws:
TLcdOutOfBoundsException
- If theILcdPoint
aXYPoint
is not within the valid area of the projection (visible area), then this exception is thrown.
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world2lonlatOnEllipsoidSFCT
public void world2lonlatOnEllipsoidSFCT(ILcdPoint aXYPoint, ILcdEllipsoid aEllipsoid, ILcd2DEditablePoint aLLPSFCT) throws TLcdOutOfBoundsException Description copied from class:ALcdProjection
Default implementation callsworld2lonlatOnSphereSFCT
withaEllipsoid.getAuxRadius()
as sphere radius.- Specified by:
world2lonlatOnEllipsoidSFCT
in interfaceILcdProjection
- Overrides:
world2lonlatOnEllipsoidSFCT
in classALcdProjection
- Parameters:
aXYPoint
- projected point for which the corresponding geodetic point is sought.aEllipsoid
- ellipsoid on which the geodetic coordinate is defined.aLLPSFCT
- resulting geodetic coordinate as side effect.- Throws:
TLcdOutOfBoundsException
- If theILcdPoint
aXYPoint
is not within the valid area of the projection (visible area), then this exception is thrown.
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inLonLatBounds
Description copied from interface:ILcdProjection
Checks if anILcdPoint
is inside the valid area of geodetic coordinates of the projection. The valid area is determined by the LonLatPoints that are visible and for which the corresponding cartesian coordinate is within the boundaries.- Parameters:
aLLHP
-ILcdPoint
to be checked upon.- Returns:
true
if valid,false
if invalid.
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boundaryLons
public double[][] boundaryLons(double aLat) Description copied from class:ALcdProjection
Default implementation. To be redefined for specific projections.- Specified by:
boundaryLons
in interfaceILcdProjection
- Overrides:
boundaryLons
in classALcdProjection
- Parameters:
aLat
- latitude in decimal degrees and -90.0 <=aLat
<= 90.0.- Returns:
- the array of pairs of longitudes[0] and longitudes[1], where the closed interval longitudes[0] -> longitudes[1] is in visible area and -180.0 <= lon[i] <= 180.0.
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boundaryLats
public double[][] boundaryLats(double aLon) Description copied from class:ALcdProjection
Default implementation. To be redefined for specific projections.- Specified by:
boundaryLats
in interfaceILcdProjection
- Overrides:
boundaryLats
in classALcdProjection
- Parameters:
aLon
- longitude in decimal degrees -180.0 <= lon <= 180.0 .- Returns:
- the array of pairs of latitudes lats[0] and lats[1], where the closed interval lats[0] -> lats[1] is in visible area and -90.0 <= lats[i] <= 90.0 .
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world2DEditableBoundsOnSphereSFCT
The projection is cut off because only one hemisphere is projected.- Parameters:
aRadius
- radius of the sphere.aWorldBound
- the bounds of the projection in world coordinates as side effect.
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inWorldBoundsOnSphere
Description copied from interface:ILcdProjection
Checks if aILcdPoint
is inside the valid cartesian area of the projection. The valid cartesian area is determined naturally by the projection bounds or by an artificial introduced boundary limit because some cartesian points are at infinity. The shape of the valid cartesian area is in many cases rectangular or circular although it might be more complex.- Parameters:
aXYPoint
- point to be checked upon.aRadius
- radius of the sphere.- Returns:
true
if valid,false
if invalid.
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inWorldBoundsOnEllipsoid
Description copied from class:ALcdProjection
Default implementation callsinWorldBoundsOnSphere
withaEllipsoid.getAuxRadius()
as sphere radius.- Specified by:
inWorldBoundsOnEllipsoid
in interfaceILcdProjection
- Overrides:
inWorldBoundsOnEllipsoid
in classALcdProjection
- Parameters:
aXYPoint
- point to be checked upon.aEllipsoid
- ellipsoid on which the geodetic coordinate is defined.- Returns:
true
if valid,false
if invalid.- See Also:
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world2DEditableBoundsOnEllipsoidSFCT
public void world2DEditableBoundsOnEllipsoidSFCT(ILcdEllipsoid aEllipsoid, ILcd2DEditableBounds aWorldBoundsSFCT) Description copied from class:ALcdProjection
Default implementation callsworld2lonlatOnSphereSFCT
withaEllipsoid.getAuxRadius()
as sphere radius.- Specified by:
world2DEditableBoundsOnEllipsoidSFCT
in interfaceILcdProjection
- Overrides:
world2DEditableBoundsOnEllipsoidSFCT
in classALcdProjection
- Parameters:
aEllipsoid
- ellipsoid considered.aWorldBoundsSFCT
- the bounds of the projection in world coordinates as side effect.
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toString
Returns theString
representation of the stereographic projection.- Specified by:
toString
in interfaceILcdProjection
- Overrides:
toString
in classObject
- Returns:
- the
String
representation of the stereographic projection.
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clone
Description copied from interface:ILcdProjection
Makes a deep clone of thisILcdProjection
.- Specified by:
clone
in interfaceILcdProjection
- Overrides:
clone
in classALcdAzimuthal
- Returns:
- deep clone of this
ILcdProjection
.
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